Haloalkanes And Haloarenes Test

Result

Haloalkanes And Haloarenes Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

C-Cl bond is stronger than C-I bond because

A
C-Cl bond is more ionic than C-I bond

B
C-Cl bond length is greater than C-I bond

C
C-I bond is less covalent than C-CI

D
C-CI bond has lesser bond enthalpy than C-I

Solution

(i) C - Cl bond length is shorter than C - I bond length because chlorine atom is smaller in size as compared to iodine atom.
(ii) C - Cl bond is more ionic than C - I bond because of greater difference in electronegativities of C and Cl as compared to that of carbon and iodine.
(iii) More ionic character of bond, more will be its strength.

∴ C - C1 bond is stronger than C - 1 bond because C - Cl bond is more ionic than C - L
Question 2
1 / -0

Which of the following has the highest melting point?

A
Ortho-isomeric dihalobenzene

B
Meta-isomeric dihalobenzene

C
Para-isomeric dihalobenzene

D
All of these have the same melting point.

Solution

Para-isomeric dihalobenzene has the highest melting point as compared to ortho-and meta-isomeric dihalobenzenes. It is due to the symmetry of para-isomer that fits in crystal lattice better as compared to ortho-and meta-isomer dihalobenzenes.
Question 3
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Directions For Questions

The question consists of two statements: Assertion and Reason. While answering the question, you are required to choose any one of the following four responses.

...view full instructions

Assertion: o-Dichlorobenzene is more soluble in organic solvents than the corresponding p-isomer.
Reason: o-Dichlorobenzene is polar, while p-dichlorobenzene is not.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B
Both Assertion and Reason are true, but Reason is not a correct explanation of Assertion.

C
Assertion is true, but Reason is false.

D
Assertion is false and Reason is true.

Solution

p-Dichlorobenzene being more symmetrical than o-isomer fits closely in the crystal lattice and hence, greater amount of energy is needed to break the crystal lattice. Thus, p-isomer is less soluble than o-isomer.

Hence, both Assertion and Reason are true, but Reason is not a correct explanation of Assertion.